Valcour Island, Lake Champlain, Crown Point Formation (Ordovician of the United States)

Where: New York (44.6° N, 73.4° W: paleocoordinates 28.1° S, 54.8° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Crown Point Formation (Chazy Group), Chazyan (470.0 - 457.3 Ma)

• "trilobite layer = middle Chazy", in Raymond (1916)

• group of beds-level stratigraphic resolution

Environment/lithology: reef, buildup or bioherm; lithified lime mudstone and limestone

• calcilutite to calcisiltite

Size classes: macrofossils, mesofossils

Primary reference: P. E. Raymond. 1916. The Pelecypoda of the Chazy Formation. Annals of the Carnegie Museum 328:325-343 [B. Kröger/B. Kröger]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 171704: authorized by Björn Kröger, entered by Björn Kröger on 17.07.2015

Creative Commons license: CC BY (attribution)

Taxonomic list

Trilobita
 Phacopida - Cheiruridae
Sphaerexochus parvus3, "Ceraurus polydorus" = Laneites polydorus3
Sphaerexochus parvus3 Billings 1865 trilobite
"Ceraurus polydorus" = Laneites polydorus3 Billings 1865 trilobite
 Asaphida - Asaphidae
"Isotelus canalis" = Isoteloides canalis3
"Isotelus canalis" = Isoteloides canalis3 Whitfield 1886 trilobite
 Lichida - Lichidae
Amphilichas minganensis3 Billings 1865 trilobite
 Corynexochida - Illaenidae
"Illaenus incertus" = Eastonillaenus incertus3
"Illaenus incertus" = Eastonillaenus incertus3 Webby 1973 trilobite
Cephalopoda
 Actinocerida - Gonioceratidae
Gonioceras chaziense1 Ruedemann 1906
Gastropoda
 Euomphalina - Macluritidae
Maclurites magnus3 Le Sueur 1818 snail
Tergomya
 Scenelloidea - Scenellidae
Scenella robusta2 Raymond 1905
Bivalvia
 Solemyida - Ctenodontidae
Ctenodonta peracuta Raymond 1905 clam
 Mytilida - Modiolopsidae
Whiteavsia expansa Raymond 1906 clam
 Myalinida - Ambonychiidae
"Clionychia montrealensis" = Cleionychia montrealensis, "Ambonychia curvata" = Ambonychiopsis curvata
"Clionychia montrealensis" = Cleionychia montrealensis Billings 1859 clam
"Ambonychia curvata" = Ambonychiopsis curvata Raymond 1905 clam
 Cyrtodontida - Cyrtodontidae
Cyrtodonta scala Raymond 1906 clam
 Modiomorphida - Modiomorphidae
Endodesma tranceps Raymond 1916 clam
Rhynchonellata
 Orthida - Orthidae
Orthis perveta3 Conrad 1843
 Orthida - Plectorthidae
"Hebertella borealis" = Mimella borealis3
"Hebertella borealis" = Mimella borealis3 Billings 1859
 Rhynchonellida - Sphenotretidae
"Zygospira acutirostris" = Sphenotreta acutirostris4
"Zygospira acutirostris" = Sphenotreta acutirostris4 Hall 1847
Strophomenata
 Strophomenida - Furcitellidae
"Rafinesquina incrassata" = Dactylogonia incrassata3
"Rafinesquina incrassata" = Dactylogonia incrassata3 Hall 1847